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88Ra226
Radium
Alkaline earth metalsBlock sPeriod 7Group 2solid at 20 °C
Configuration :[Rn] 7s²
Atomic mass :226 u
3D Bohr-model representation of the Radium atom (symbol Ra, atomic number Z=88). Electron shell configuration: 2, 8, 18, 32, 18, 8, 2 electrons.
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Bohr model · educational
Electron configuration
Full[Rn] 7s²
Short[Rn] 7s²
Valence electrons2
KLMNOPQ shells
K2
L8
M18
N32
O18
P8
Q2
Electronegativity
Pauling0.9
Allen—
Mulliken (eV)—
Atomic radii
Empirical215 pm
Calculated—
Covalent221 pm
Van der Waals283 pm
Ionic radii (Shannon-Prewitt)
+2148 pm
Successive ionisation energies
I₁509.3 kJ/mol
I₂979 kJ/mol
Electron affinity—
Oxidation states
+2
Bold states = most common.